Huge Cloud on Saturn's Moon Titan Is Made of Toxic Cyanide

[Buster's Uncle]

Huge Cloud on Saturn's Moon Titan Is Made of Toxic Cyanide
SPACE.com
by Charles Q. Choi, SPACE.com Contributor  8 hours ago



The giant swirling cloud on Saturn's largest moon Titan is seen here in two images from NASA's Cassini spacecraft. At left is a spectral map of the cloud taken on Nov. 29, 2012. The inset at right is a natural color view of the cloud



nature: It's made of cyanide gas.

The discovery suggests that the air above Titan's poles can get much cooler than previously thought, scientists said. The huge cloud on Titan — it's about the size of Egypt — was first spotted by NASA's Cassini spacecraft in 2012, but only now is its cyanide composition understood.

Cassini images show that the giant spinning cloud growing over Titan's southern pole covers an area of more than 386,000 square miles (1 million square kilometers).

"The cloud was first seen in images from Cassini's cameras taken in 2012," study co-author Nick Teanby at the University of Bristol in England said in a statement. "It started off quite small but soon grew to cover the entire south polar region. This was totally unexpected and set us puzzling over what the cloud could be made of."


Titan's giant cyanide cloud

Surprisingly, Cassini found the cloud existed at very high altitudes, about 180 miles (300 km). The presence of a cloud at such heights is unexpected because previous estimates of the temperatures at this altitude have been too high to allow cloud formation.

Unfortunately, while the Cassini images showed that the cloud was very high up, "they did not allow us to figure out what the cloud was actually made of or why it was there," Teanby said in a statement.



NASA's Cassini spacecraft captured this view of a giant cloud over the south pole of Titan, Saturn's largest moon, in September 2012. Now, scientists have discovered that the cloud is made up of toxic cyanide.


Now, after analyzing two more years of data from Cassini, the researchers found this cloud is made of cyanide — specifically, "ice particles of hydrogen cyanide, or 'blauwzuur,' blue acid, as it's known in the Netherlands, which is highly toxic," lead study author Remco de Kok, a planetary scientist at Leiden University in the Netherlands, said in a statement.

Hydrogen cyanide is expected to condense in Titan's atmosphere at an altitude of about 50 miles (80 km), and research has detected a nearly imperceptible tropical haze layer at this height matching this gas. However, Titan's atmosphere was expected to be too warm at higher altitudes for hydrogen cyanide to form.

"Hydrogen cyanide ice was quite surprising, and not expected at this location," de Kok told Space.com.

This new finding reveals that the polar atmosphere above Titan's south pole must be extremely cold to allow hydrogen cyanide to condense, much cooler than thought possible at those altitudes — minus 234 degrees F (minus 148 degrees C), about 180 F (100 C) colder than once predicted.

The researchers said that very dramatic cooling must be taking place inside the winter vortex of winds over Titan's south pole.



This amazing view of a giant cloud over the south pole of Titan, Saturn's largest moon, was taken by NASA's Cassini spacecraft on June 27, 2012. The cloud is made up of toxic cyanide gas, new studies have found.


"There may be gases present there that radiate a lot of energy away in the infrared, cooling the atmosphere there," de Kok said.


Seasons on Titan

Titan is the only moon in the solar system with clouds and a dense, planetlike atmosphere. Like Earth, Titan's atmosphere is mostly nitrogen, but unlike modern Earth, methane is the next most important part of Titan's atmosphere. The makeup of Titan's atmosphere resembles certain models of early Earth, before oxygen was a significant component of Earth's atmosphere.

Titan's atmosphere is experiencing a change of seasons, with spring arriving in the north and autumn in the south. Titan has seasons just like Earth, only each season lasts more than seven years instead of three months.

In 2015, Cassini will peer at Titan to help see how cold Titan's south pole is, de Kok noted. "It is exciting thinking about how the cloud might develop in that time," he said.

The Titan cyanide cloud study is detailed in the Oct. 2 edition of the journal Nature.


http://news.yahoo.com/huge-cloud-saturns-moon-titan-made-toxic-cyanide-172406086.html

[Buster's Uncle]

Cyanide fog marks winter's onset on Saturn moon Titan
AFP
6 hours ago



This true color handout image captured by NASA's Cassini spacecraft before a distant flyby of Saturn's moon Titan on June 27, 2012, shows a south polar vortex, or a mass of swirling gas around the pole in the atmosphere of the moon (AFP Photo/Ho)



Paris (AFP) - A cyanide cloud formed over Titan's south pole as the strange moon of Saturn entered its seven-year winter in 2009, astronomers reported on Wednesday.

An enigma of the Solar System, Titan is studded with lakes of liquid hydrocarbons and a choking nitrogen-methane atmosphere, according to data sent back by a US-European scout mission.

The satellite and its mother planet are so far from the Sun -- 1.4 billion kilometres (886 million miles) -- that each season on Titan lasts seven Earth years instead of three months.

Reporting in the journal Nature, scientists led by Nick Teany at the University of Bristol in western England, said the US orbiter Cassini first spotted a cloud over Titan's south pole five years ago.

Two years of observation found the cloud comprised icy particles of hydrogen cyanide.

The discovery showed that the onset of winter on Titan is sharp and brutal even in this extremely cold region of space.

"Titan's south pole must be extremely cold to allow hydrogen cyanide to condense," a university press statement said.

"In fact the upper atmosphere must have cooled by over 50 degrees (Celsius or 90 degrees Fahrenheit) in less than a year to reach a blisteringly cold minus 150 C."


http://news.yahoo.com/cyanide-fog-marks-winters-onset-saturn-moon-titan-194857722.html